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//===-- ARMAsmParser.cpp - Parse ARM assembly to MCInst instructions ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmLexer.h"
#include "llvm/MC/MCAsmParser.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/TargetAsmParser.h"
using namespace llvm;
namespace {
struct ARMOperand;
class ARMAsmParser : public TargetAsmParser {
MCAsmParser &Parser;
private:
MCAsmParser &getParser() const { return Parser; }
MCAsmLexer &getLexer() const { return Parser.getLexer(); }
void Warning(SMLoc L, const Twine &Msg) { Parser.Warning(L, Msg); }
bool Error(SMLoc L, const Twine &Msg) { return Parser.Error(L, Msg); }
bool ParseDirectiveWord(unsigned Size, SMLoc L);
public:
ARMAsmParser(const Target &T, MCAsmParser &_Parser)
: TargetAsmParser(T), Parser(_Parser) {}
virtual bool ParseInstruction(const StringRef &Name, MCInst &Inst);
virtual bool ParseDirective(AsmToken DirectiveID);
};
} // end anonymous namespace
bool ARMAsmParser::ParseInstruction(const StringRef &Name, MCInst &Inst) {
SMLoc Loc = getLexer().getTok().getLoc();
Error(Loc, "ARMAsmParser::ParseInstruction currently unimplemented");
return true;
}
bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
StringRef IDVal = DirectiveID.getIdentifier();
if (IDVal == ".word")
return ParseDirectiveWord(4, DirectiveID.getLoc());
return true;
}
/// ParseDirectiveWord
/// ::= .word [ expression (, expression)* ]
bool ARMAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
if (getLexer().isNot(AsmToken::EndOfStatement)) {
for (;;) {
const MCExpr *Value;
if (getParser().ParseExpression(Value))
return true;
getParser().getStreamer().EmitValue(Value, Size);
if (getLexer().is(AsmToken::EndOfStatement))
break;
// FIXME: Improve diagnostic.
if (getLexer().isNot(AsmToken::Comma))
return Error(L, "unexpected token in directive");
getLexer().Lex();
}
}
getLexer().Lex();
return false;
}
// Force static initialization.
extern "C" void LLVMInitializeARMAsmParser() {
RegisterAsmParser<ARMAsmParser> X(TheARMTarget);
RegisterAsmParser<ARMAsmParser> Y(TheThumbTarget);
}
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